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US 9,845,312 B2Granted
Process for the preparation of 5-fluoro-1H-pyrazoles
AssigneeBayer CropScience AG
InventorsSergii Pazenok, Norbert Lui
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Abstract
A new process for the preparation of 5-fluoro-1H-pyrazoles of the general formula (I) as described herein comprising reacting an olefin with an hydrazine.
Claims15
A process for the synthesis of a 5-fluoro-1H-pyrazoles of formula (I)
- by reacting an olefin of formula (a)
- with one or more nucleophiles, and optionally a base,
- followed by reacting with one or more hydrazines of formula (b)
- R1—NH—NH2 (b),
- wherein
- R1 is selected from C1-C6 alkyl, cycloalkyl, or C5-C10 aryl;
- R2 is a trihalomethyl moiety with at least one fluorine atom;
- and
- R3 is selected from C1-C5 haloalkyl;
- and the nucleophile is not water.
7 more elements
Dependencies are inferred from the claim text.